Telephone-transmitter.



F. GOTTSUHALK.

TELEPHONE TRANSMITTER.

APPLICATION FILED SEPT.13, 1909.

Patented Feb.22, 1910.

INVENTOR,

WITNESSES FELIX GOTTSCHALK, OF NEW YORK, N. Y.

TELEPHONE-TRANSMITTER.

Application filed September 13, 1909.

Specification of Letters Patent.

Patented Feb. 22, 1910.

Serial No. 517,378.

To all whom it may concern:

Be it known that I, FELIX Go'rTsorrALx, citizen of the United States of America, and resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in TelephoneTransmitters, of which the following is a full, clear, and exact description.

This invention relates to improvements in telephone transmitters of a kindcomprising a casing having a front aperture, a diaphragm supported within the casing and a device connected, or in engagement, with the diaphragm and extended to said aperture for concentrating sound waves passing through said aperture toward a centralized point on said diaphragm as described and set forth in Letters Patent of the United. States granted to me July 20, 1909, No. 928,651.

Objects of the invention are to dispense with the employment of the usual funnel shaped mouth piece on the transmitter forward of the diaphragm, and the guard in the mouth-piece, as heretofore almost universally employed, whereby, principally, the instrument is rendered very much more sanitary and will not become a collector of germs, dirt and dust in anywhere near the extent inevitable in the transmitter of present use; to simplify, lighten and cheapen the construction of the portions of the instrument which are intimately combined with the diaphragm; and to provide means whereby the sensitive or delicate diaphragm may not be deranged or put out of adjustment as by the tapping, with a pen-holder or pencil, at the front of the instrument as is frequently done by inconsiderate persons making use of the telephone.

The invention consists in the combination in the telephone transmitter of certain parts having arrangements, and also constructions, as hereinafter described in conjunction with the accompanying drawings and set forth in the claims.

In the drawings :Figure 1 is a sectional view on a somewhat enlarged scale centrally and vertically through a telephone transmitter which is equipped with my present improvements. Fig. 2 is a view substan tially similar to Fig. 1 but showing some of the parts as having slightly modified forms and relations.

view of parts of the device in separated rea lations.

In the drawings, A represents the casing of the telephone transmitter of which A is the front wall having an aperture (4 centrally therethrough,B representing the diaphragm in its usual position closely behind the front wall A and C represents the cup or butt-on containing the granulated carbon or electrodes as usual.

D represents an axially horizontal and forwardly flaring cup shaped shell, connected centrally, at what may be regarded as its base or back to the diaphragm and having its outer edge located in proximity to the margin of the said aperture a, and as here shown the outer edge of the said shell is made with a flange 1) which has an overlapping relation to the portion of the front wall of the casing next to the said aperture.

The resistance cup C in contact against the front of which is the diaphragm has anchored or rigidly connected or embedded therein a stud (Z which extends forwardly through and beyond the central portion of the diaphragm and through and beyond the centrally apertured base or back portion of the shell D and receives with screw engagement thereon the nut e which bottoms against the back of the shell and clamps it to the diaphrag The said confining nut e is inclosed and protected by a member f which may be connected and supported either by being externally screwthreaded at its base portion and screw engaged in an appropriate socket therefor provided in the base portion of the shell D, said member being hollowed or chambered from the rear to give space for occupancy therein of the nut c and stud cl as represented in Fig. 1; or the said chambered member may, as represented in Fig. 2, have a screw threaded socket f axially formed and inwardly opening at its front wall, such socket extending only partially through the thickness of such wall so that the end of the socket may bottom against the forward end of the stud while the rear annular portion of the member f is preferably free from any actual contact or binding bearing against the back or base of the very thin cup shaped shell D; although in practice the rear annular edge of the member is to be so close to the back Fig. 31s a perspective 1 of the cup shaped shell that any space or opening between such parts is practically imperceptible. The said nut and stud inclosing member f is inwhole or in part substantially conical or conoidal; although, as represented in Fig. 1, the forward portion of the member is made with a circumferential knurled flange f A resilient cushion g is provided to have a position between the portion of the front wall of the casing which is marginally of the aperture and the adjacent portion of the said shell, said cushion being preferably supported by one of said parts and being free and having a clearance relatively to the other; and in Fig. 1 this cushion is indicated as constituted by an elastic rubber band which by a portion of its width is stretched around the flange b of the cup shaped shell, while a portion of its width constitutes an annular web, as indicated at 2 at and inwardl extendin from the rear D circular edge of the shell flange and parallel and clear from, though very near to, the front face of the wall A of the casing; while in Fig. 2 the said cushion is represented as an annular band supported directly on the front wall of the casing behind the flange of the cup shaped shell, such flange being clear of, though very close to, such cushion. v

Inasmuch as the diaphragm in its operationhas a vibration within a range of about three one-hundredths of an inch, it is designed that the clearance between the cup shaped shell and front wall of the casing at the place where the said cushion is pro vided shall be approximately equal to the scope of the diaphragms vibration; and any pressure improperly exerted against the cup shaped shell as mi ht be done by a person using a pencil or ot er sharp pointed article will be resisted by the interposed cushion whereby distortion or derangement of the diaphragm is guarded against; and the said cushion furthermore constitutes a factor for the practical exclusion of dust or dirt passing by way of the aperture a from the outside into the interior of the instrument.

The cup shaped shell, as the same has been constructed by me, has been of very thin sheet brass, spun up to the required form; but the same may be advantageously made of other thin metal, such, for instance, as aluminum, or it may be made of other material, such as glass, vulcanized rubber, or molded fiber; and the said shell either in whole or in part may be rendered antiseptic either by being impregnated, or coated or surfaced with an antiseptic material or'solution.

A telephonic transmitter in which my present improvements are embodied has as great, (if not increased,) operative efficiency as any transmitters heretofore known and used, and in addition to having the ad- I vantages hereinabove emphasized is considered more attractive and sightly than one having the decidedly forwardly protruding funnel shaped black rubber mouth piece; and a person making use of this transmitter will naturally speak with the mouth at the usual distance from the front of the casing and need never bring the lips to contact with any portion thereof.

I claim 1. In a telephone transmitter, the combination with the casing having an apertured front wall, and the diaphragm in the casing behind such wall, of a forwardly flaring cup shaped shell connected centrally to the diaphragm, and provided at its outer edge with a flange which has an overlapping relation to the margin of said aperture.

2. In a telephone transmitter, the combination with the casing having'an apertured front wall, and the diaphragm in the casing behind such wall, of a forwardly flaring cup shaped shell connected centrally to the dia phragm, and having its outer edge located in proximity to the margin of said aperture, and a resilient cushion having a position between the portion of the casing marginally of its aperture and the adjacent portion of the said shell.

3. In a telephone transmitter, the combination with the casing having an apertured front wall, and the diaphragm in the casing behind such wall, of a forward flaring cup shaped shell connected centrally to the diaphragm, and having its outer edge located in proximity to the margin of said aperture, and an annular resilient cushion mounted on the portion of the casing marginally of its aperture, and in proximity to the adja cent portion of the said shell. 7

4. In a telephone transmitter, the combination with the casing having an apertured front wall, the diaphragm in the casing behind such wall, and a threaded stud extending forwardly from the central portion of the diaphragm, of a forwardly flaring cup shaped shell in contact centrally with the diaphragm, and through which said stud forwardly protrudes, a nut screwing on the stud and engaging against the base of the shell and a member lnclosing, and serving as a guard to, the forward portion of the stud.

. 5. In a telephone transmitter, the combination with the casing having an apertured front wall, the diaphragm in the casing behind such wall, the resistance cup behind the diaphragm having secured thereto a threaded stud which extends forwardly through and beyond the central portion of the diaphragm, of a forwardly flaring cup shaped shell in contact centrally with the diaphragm, and through which said stud forwardly protrudes, a nut screwing on'the stud, engaging the shell and clamping it to the diaphragm and a substantially 'conical forwardly closed and rearwardly chambered member supported within the cup shaped shell and inclosing the said stud and nut.

6. In a telephone transmitter, the combination with the casing having an apertured front wall, the diaphragm in the casing behind such wall, and a threaded stud extending forwardly through and beyond the diaphragm, of an outwardly flaring cup shaped shell having the back thereof disposed centrally against the diaphragm and through which said stud forwardly protrudes and having its outer edge portion located in proximity to the margin of said aperture, a nut screwing on the stud and engaging against the back of the shell and a substantially conical forwardly closed and rearwardly chambered member having internally thereof a threaded socketed portion which screw engages on the extremity of said stud. Signed by me at Springfield, Mass, in presence of two subscribing witnesses.

FELIX GOTTSCHALK. Witnesses G. R. DmsooLL, WM. S. BELLows. 

